“…We also included patents filed in IPC, "A61B 18/2," "A61F 9/008," "A61F 9/009," "A61N 5/068," "A62D 3/17," "B22F 3/105," "B23H 7/38," "B29C 65/16," "B41J 2/455," "F21K 9/00," "F21Y 115/30," "G01C 19/66," "G01N 21," "G02B 27/48," "G11B 7/127," and "G11B 11/03" whenever the patent title contained "laser". 5 For all string matchings, a 2-gram Jaccard similarity was employed as proposed by Schoen et al (2014) for German patent data. We use a threshold of 0.8 because our sample allows for manual data checking.…”